bug#23959: 25.0.94; find: missing argument to `-exec'

[Tino Calancha]

Thank you for the report.
> I believe this is because the fish shell interprets the "{}" as a brace
> expansion -- see
> http://fishshell.com/docs/current/index.html#expand-brace -- and needs
> the braces to be escaped. Editing the grep command using C-u and
> inserting quotes around the braces makes it work as expected.
Yes, braces should be escaped in commands to be processed by a shell.
I am going to apply following patch to the master branch:
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diff --git a/lisp/progmodes/grep.el b/lisp/progmodes/grep.el
index 2b44b58..f7f097b 100644
--- a/lisp/progmodes/grep.el
+++ b/lisp/progmodes/grep.el
@@ -543,7 +543,9 @@ grep-compute-defaults
   (let* ((host-id
          (intern (or (file-remote-p default-directory) "localhost")))
         (host-defaults (assq host-id grep-host-defaults-alist))
-        (defaults (assq nil grep-host-defaults-alist)))
+        (defaults (assq nil grep-host-defaults-alist))
+         (quot-braces (shell-quote-argument "{}"))
+         (quot-scolon (shell-quote-argument ";")))
     ;; There are different defaults on different hosts.  They must be
     ;; computed for every host once.
     (dolist (setting '(grep-command grep-template
@@ -637,9 +639,8 @@ grep-compute-defaults
                                     "")))
                         (cons
                          (if (eq grep-find-use-xargs 'exec-plus)
-                             (format "%s %s{} +" cmd0 null)
-                           (format "%s {} %s%s" cmd0 null
-                                   (shell-quote-argument ";")))
+                             (format "%s %s%s +" cmd0 null quot-braces)
+			    (format "%s %s %s%s" cmd0 quot-braces null 
quot-scolon))
                          (1+ (length cmd0)))))
                      (t
                       (format "%s . -type f -print | \"%s\" %s"
@@ -655,12 +656,11 @@ grep-compute-defaults
 			 (format "%s <D> <X> -type f <F> -print0 | \"%s\" 
-0 %s"
                                 find-program xargs-program gcmd))
                        ((eq grep-find-use-xargs 'exec)
-                        (format "%s <D> <X> -type f <F> -exec %s {} %s%s"
-                                find-program gcmd null
-                                (shell-quote-argument ";")))
+                        (format "%s <D> <X> -type f <F> -exec %s %s %s%s"
+				 find-program gcmd quot-braces null 
quot-scolon))
                        ((eq grep-find-use-xargs 'exec-plus)
-                        (format "%s <D> <X> -type f <F> -exec %s %s{} +"
-                                find-program gcmd null))
+                        (format "%s <D> <X> -type f <F> -exec %s %s%s +"
+                                find-program gcmd null quot-braces))
                        (t
 			 (format "%s <D> <X> -type f <F> -print | \"%s\" 
%s"
                                 find-program xargs-program gcmd))))))))

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In GNU Emacs 25.1.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.20.6)
 of 2016-07-13
Repository revision: 54b7eb0dee2397f1430e81b7356f8efb19946ba0